Propeller



Oct. 2, 1928. 1,686,214

' R. N. KYLE PROPELLER Filed March 8, 192.7

' INVENTOR fiayzm /V. KYLE ATTORNEYS.

Patented Oct. 2, 1928.

UNITED STATES ROYAL N. KYLE, OF GARDNERVILLE, NEVADA.

PROPELLEB.

Application filed March 8, 1927 Serial-No. 173,694.

The present invention relates to improvements in propellers and hasparticular ref.- erence to an airplane propeller, altho the principlesembodied therein may be used in connection with other propellers. Theprin cipal object of the present invention is to provide a propeller ofopen construction in which the active propeller blades are arranged at adistance from the hub and are supported relative thereto by means ofarms or rods, which offer little resistance to the air passingtherethrough. It is further proposed to arranged the arms relative tothe hub in such a manner that the ends thereof 1 lie in a helical curveof which the axis of the hub forms the center line.

It is further proposed to provide a pro- 'peller of the characterdescribed that is very simple in construction and economical tomanufacture.

Further objects and advantages of my propeller will appear as thespecification proceeds.

The preferred form of my propeller is illustrated in the accompanyingdrawing, in which Figure 1 shows a front View of my propeller;

Figure 2 a top plan view;

Figure 3 a side view as seen from line 33 of Figure 1;

Figure 4 a sectional view taken along line 14 of Figure 1;

Figure 5 a sectional view taken along line 55 of Figure 1.

\Vhile I have shown only the preferred form of my invention, it shouldbe understood that various changes or modifications may be made withinthe scope of the claims hereto attached without departing from thespirit of the invention.

My propeller 1 includes a hub 2 which by means of a screw 13, or byother means, may be fastened to the end of a crank shaft driven by anengine, not shown in the drawing. From the hub which is preferablycylindrical in form and round at the front as I shown at 42, extend twosets of radial arms 1 6, the two sets being arranged in paralleltransverse planes and arranged at an angle to one another so that theends of the coordinate arms lie substantially in the curve of a helix ata distance from the axis of the hub. The two opposing arms are alignedand may be made in one piece extending through the hub, as illustratedin the drawmg. g

Blades 7'arefastened to the ends of each two coordinate arms at adistance from the hub, the blades being formed along the lines of ascrew propeller so as to substantially lie in a helical plane. Theblades may be' made hollow, as shown at 8, and formed with perforations9 at the inner ends thereof through which the arms 6 may enter. Thelatter arms are sufiiciently resilient to be sprung into theperforations and preferably extend throughout the blades as illustratedin the drawing. The blades are" tapered toward the axis as shown at 11,the front and rear edges of each blade running sub-V stantia-lly inradial direction and parallel to the arms 6. It will be noted that whenthe blades are slipped over two arms they are locked in placed by theirtapered form.

It will be noted that in a propeller of" this character littleresistance is offered to" I ROYAL N, KYLE.

